基于燃气分析法的航空发动机燃烧室性能研究

为深入了解燃烧室性能,用燃气分析法测量了燃烧室在高压状态下的气态污染物排放和排气冒烟,用热电偶法测量了燃烧室出口温度场.混合式取样器安装于摆盘上,随摆盘沿周向匀速旋转采集样气,通过测试仪器分析样气组分,计算得到了燃烧室的油气比、燃烧效率、污染物排放指数及冒烟数.通过比较采用燃气分析法和流量法得到的油气比、燃烧效率的测试结果,分析了慢车状态误差偏高的原因,结果表明:燃气分析法是1种准确、可靠的燃烧室性能测试方法.改进了混合式取样器结构,提高了排气冒烟测试的精度.

Research on aeroengine combustor perfermance based on gas analysis method

In order to understand combustor performance, a gas analysis system was used to measure gaseous emission and smoke,the thermocouple was used to measure temperature field for understanding combustion performance in high pressure state. The mixedsampler was installed on a swing plate which moved regularity in circle. The gas component was got through test instrument. The fuel airratio, combustor efficiency, gaseous emission and smoke number were calculated. The fuel air ratio was compared by gas analysis andmeasuring flow as well as the combustor efficiency by gas analysis and thermocouple. The reason of high error was analyzed in ground idlecondition. It indicates that the gas analysis method is an accurate and reliable method of testing combustion performance. Mixed samplerwas improved to get exact smoke number.